243402155 has 4 divisors (see below), whose sum is σ = 292082592. Its totient is φ = 194721720.

The previous prime is 243402151. The next prime is 243402167. The reversal of 243402155 is 551204342.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 243402155 - 2² = 243402151 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243402151) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24340211 + ... + 24340220.

It is an arithmetic number, because the mean of its divisors is an integer number (73020648).

Almost surely, 2^243402155 is an apocalyptic number.

243402155 is a deficient number, since it is larger than the sum of its proper divisors (48680437).

243402155 is an equidigital number, since it uses as much as digits as its factorization.

243402155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48680436.

The product of its (nonzero) digits is 4800, while the sum is 26.

The square root of 243402155 is about 15601.3510632894. The cubic root of 243402155 is about 624.3692024987.

Adding to 243402155 its reverse (551204342), we get a palindrome (794606497).

The spelling of 243402155 in words is "two hundred forty-three million, four hundred two thousand, one hundred fifty-five".